Simple PSF based method for pupil phase mask’s optimization in wavefront coding system

Zhang, Wenzi; Chen, Yanping; Zhao, Ting; Ye, Zi; Yu, Feihong

doi:10.1631/jzus.2007.a0180

Cited by 10 publications

(4 citation statements)

References 9 publications

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“…The application of three rotating symmetric optical pupil masks, a single Gaussian ring mask, a multi-Gaussian ring mask, and a quadratic type phase mask, in increasing DoF is investigated in Ref. [7] and [8]. Currently, WFC systems have been used for super-resolution [9], passive ranging [10], expanding DoF [11] and so on.…”

Section: Wavefront Coding (Wfc)mentioning

confidence: 99%

Research on an image restoration method of cubic phase plate wave-front coding with mixed noise

Zhang,

Chen,

Wang

et al. 2024

Fifteenth International Conference on Graphics and Image Processing (ICGIP 2023)

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Wave-front coding (WFC) is a technique that adds a phase plate to an optical system's pupil exit surface. This technique first encodes the image so that the system's optical transfer function is insensitive to out-of-focus throughout a wide depth-of-focus (DoF), resulting in a blurred image. Furthermore, image noise would inevitably be generated because of device part failure or external interference. As a result, we would acquire a noisy and blurred image. The image needs to be restored to improve the imaging system's DoF. A series of experiments have been carried out to find the optimal image restoration solution. In this paper, we proposed a three-step image restoration scheme for noisy blurred images after cubic phase plate. At first, we used the Min-Max Average Pooling-based Filter (MMAPF) to remove salt-and-pepper noise. Then we used Shearlet to remove Gaussian noise. Finally, for image deblurring, we used the Amended Landweber (ALW) algorithm. Experiments on real infrared images show that this scheme has excellent performance and robustness for image restoration when applied to a cubic phase plate.

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Section: Wavefront Coding (Wfc)mentioning

confidence: 99%

Research on an image restoration method of cubic phase plate wave-front coding with mixed noise

Zhang,

Chen,

Wang

et al. 2024

Fifteenth International Conference on Graphics and Image Processing (ICGIP 2023)

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“…In the long-term research process, work carried out at world around wavefront phase encoding technology mainly involves the design of phase mask functions [1][2][3][4][5][6][7] or the optimization of phase mask parameters. [8][9][10][11] However, not many researchers have considered introducing phase wavefront encoding into super-resolution imaging systems.…”

Section: Introductionmentioning

confidence: 99%

Pixel super resolution imaging technology based on phase wavefront modulation

Yang,

Zhong,

et al. 2024

Sixth Conference on Frontiers in Optical Imaging and Technology: Novel Technologies in Optical Systems

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In the field of aperture coding super-resolution imaging, an important reason limiting the image super-resolution effect is that aperture coding greatly reduces the incident light flux of the system. Phase wavefront encoding modulation technology can effectively increase the system light flux and improve image super-resolution results. However, using phase wavefront coding instead of aperture coding will cause complex frequency domain calculations. In this paper, the feasibility of the single-seam phase encoding pattern is proved through the mathematical calculation of phase wavefront coding modulation. In the subsequent reconstruction process, the Fourier ptychographic (FP) imaging algorithm is used for verification. The resolvable line pairs of the USAF are increased from Group0 Number2 to Group1 Number3, means the image resolution is approximately doubled. The optical system built based on this phase mask prove the luminous flux of the acquired down-sampled image is increased about more than 5 times, and the image signal-to-noise ratio (SNR) is increased about more than 7 times. This makes it possible for higher super-resolution computational imaging.

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“…Because of relative simplicity in manufacture, the cubic phase mask is the most widely used form in the WFC technique [6][7][8]. Various optimized methods have been used to improve the performance of the cubic phase mask (CPM) [9][10][11][12]. Zhang and Chen optimized the CPM based on Strehl ratio.…”

Section: Introductionmentioning

confidence: 99%

Optimization of Wavefront Coding Phase Mask Applied to 5X-40X Micro-Objectives Simultaneously

Liu

Miao

Sui

et al. 2015

Journal of the Optical Society of Korea

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A wavefront coding (WFC) technique provides an extension of the depth of field for a microscopy imaging system with slight loss of image spatial resolution. Through the analysis of the relationship between the incidence angle of light at the phase mask and the system pupil function, a mixing symmetrical cubic phase mask (CPM) applied to 5X-40X micro-objectives is optimized simultaneously based on point-spread function (PSF) invariance and nonzero mean values of the modulation transfer function (MTF) near the spatial cut-off frequency. Optimization results of the CPM show that the depth of field of these micro-objectives is extended 3-10 times respectively while keeping their resolution. Further imaging simulations also prove its ability in enhancing the defocus imaging.

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Simple PSF based method for pupil phase mask’s optimization in wavefront coding system

Cited by 10 publications

References 9 publications

Research on an image restoration method of cubic phase plate wave-front coding with mixed noise

Research on an image restoration method of cubic phase plate wave-front coding with mixed noise

Pixel super resolution imaging technology based on phase wavefront modulation

Optimization of Wavefront Coding Phase Mask Applied to 5X-40X Micro-Objectives Simultaneously

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